I'm building a custom HDPE enclosure for my boy Ozai - it'll be 9ft long, 2ft wide, and 2ft high. How much ventilation do you think I should add? I'm thinking a 2in x 9ft screen strip in front that goes along the upper edge above the doors and maybe a vertical 3in strip in the front center - think that would be good or do I need more on the sides? Or is it too much? It'll be up against a wall so I think anything in the back would be pretty useless.